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Basic and Diluted Earnings Per Share (EPS) Data Basic and Diluted Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share, Basic and Diluted [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
The following table reconciles the denominator used to compute basic EPS to the denominator used to compute diluted EPS for the indicated periods:
 
 
Year ended December 31,
 
 
2015
 
2014
 
2013
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
Net income (loss) attributable to CDI
 
$
(37,003
)
 
$
3,082

 
$
12,884

Denominator:
 
 
 
 
 
 
Basic weighted-average shares
 
19,676

 
19,577

 
19,442

Dilutive effect of stock-based awards
 
—

 
213

 
297

Diluted weighted-average shares
 
19,676

 
19,790

 
19,739

Earnings (loss) per common share:
 
 
 
 
 
 
Basic
 
$
(1.88
)
 
$
0.16

 
$
0.66

Diluted
 
$
(1.88
)
 
$
0.16

 
$
0.65